Pencil



Patented sept. 41, 1925.

UNITED STATES-PATENT OFFICE.

FRANK c. DELI, or CHICAGO, ILLINOIS, YAssaIeNoIar., BY MEsNE ASSIGNMENTS, 'ro

AUTOPOINT COMPANY, or CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

I:PENCIL Applcatin Ied October 3, 1921, Serial No. 504,839. Renewed July 13, 1925.

To iclzom tjmay concern: i i

Be it lknown* that I, FRANK C. DELI, a

citizen of the United States, residing at provide a cylindrical 'opening of somewhatA Chicago, in thecounty of Cook and Stateo Illinois, have invented certain new and useful Improvements inl Pencils, of which the j following is a specication.

This invention relates to a pencil-wherein is contained a propelling mechanism for ejecting a lead as required for use.y In par- .ticular my invention is concerned with certain improvements in such mechanism, and in the construction of thepencil body within which the same is contained. It is `concerned further with a novel process for producing a pencil body of'such construction.

An exemplification of preferred form is shown in the yaccompanyingdawing, wherein- Figure l is a longitudinal section through the pencil, taken on line 1-1 of Fig. 3;

Fig. 2 is a side elevation of one of thetwo sections forming the pencil body, the view looking towards its inner face;

Fig. 3 is an enlarged transverse section taken on line 3 3. of Fig. 1; and Fig. 4 is a .view Ain elevation ofthe propelling mechanism detached from the body.

In the drawing the pencil body is designated .as A, and by'preference its upper end is slitted as at 4 and reduced slightly as at 5, and over the pencil end thus rendered compressible is fitted a sleeve 6 in which is retained an eraser 7. This sleeve is tightly but removably secured to the body, and when vdetached ltherest'roln exposes the upper end of a chamber 8 which is formed in the upper region of the pencil to provide a. compartment for reserve leads, The walls composing the pencil body are transverselyextended as at 9, thus forming 'a bottom for the chamber. Extending downwardly from the transverse walls 9 to the lower end of the pencil body is a central bore 1l) which is enlarged throughout its lower Legion 11 to greater diameter. The upper region o this bore is formed with diametricaliy opposite slots 12, best shown in Fig.` 3, extending away from each other a distance about 'equal to the diameter of .the enlarged portion 11 of the bore. At the juncture ofthe two boro portions 10 and 11 the surrounding walls myinventlon in its` j cation, 1924.

At its lower tapered sleeve v15 having a cylindrical upper end as at A16 so as to fit snuglyupon the recessed lower end of the pencil. At the lower end ofthe tapered sleeve-15 which constitutes a tip for the pencil, is a central opening throu tive lead C, ounted fast Within the sleeve 15 is atube 17 arranged concentric to the The teeth so formed are adapted to engage with the tube threads 18 which result from h which is projectedvthe acthe formation of the spiral convolutions in its walls. At its upper end the plunger 19 is provided with a flattened head 20 which is laterally extendedto present its edges lwithin the oppositely disposed slots 12, thus preventing the plunger from rotation. within the pencil body.

vThe specific construction of the; tube 4and plunger form no part of the present invention, but are claimed in a cO,-pending appli- Serial No. 758,831, o:t December 30,

To effect propulsioniof the leakl, the. penll .cil tip 15 is rotated relative tothebody', and

because of the nonrotative mounting ofthe plunger therewithin the spiral threads in the tube 1 8 will cause the plunger to be.

moved longitudinally against' thelead to expel the same through the tip. When the active lead cient y to engage with the threads 18. A The has been used to its effective' limit, theentire propelling vmechanism `B 70 pencil bodyin such a manner as to lie with-7A ient method. My invention, however, conthe production of a body from so'me such material by 'afmethod which possesses spe-1 l cialadvantages This phase of my inven templates the production of a body having characteristics such as have been heretofore noted, and which is formed from a composition material that can be moulded within suitable dies; it contemplates, furthermore,`

tion will now be explained in detail.

`The material suggested for the body of a pencil such as is shown in Figs. 2 and 3 is preferably a composition that becomes plas'- tic under the application of heat and pressure. Such` materials are commercially available underthe names of bakelite, redmanol, etc. The. first step in forming the body from some such material is -to mould a 'one-haltsection thereof, the same as is shown in Fig. 2. Two such sectional halves* I claim:

are produced from' composition material, each having, by preference, a member in the nature of a tongue 25 and a groove 26 which is complementary thereto (see Fig). When so -,formed the two sections may be fitted one upon' the other with vthe tongues interlocking with the grooves so a's to center the two parts together.

Any other convenientinterlocking means 4 may be employed, however, but the one sugested will be found particularly convenient, inasmuch as it permits ,the use otbut a single mould for the making' of the two" sectional halves, the one ,being a counter- 4 part of the other. "When the two bodysections thus produced are fitted: one upon the` other, they arethen placed in a new mould,

which is thereafter subjected to the action of heat and pressure. The eect ofthis is A to suiiiciently soften thetwo body sections to unite them permanently together as A thou' h moulded in a single operation. Dur-v ing t is last heat treatment, the temperature is preferably raised to the necessary'point to set the material, thereby precludmg any possibility of its softeningagain.

A pencil produced accordin to the method just describedmay be iinishe in a ver at-y tractive manner and' will possess the esir able qualities of strength and y the eye it will not be apparent lhtness. To at the body is formed of' two umted sectionalhalves, since the lines of juncture therebetween are practically obliterated through the practice of the method --just 'described. By properly desi ning the moulds, the interior faces of the ody are made' tocorrespond with the construction shown in Fig. 1. It will be noted that the transverse wall 9 therein shown is provided in Fig. 2 by forming a button 27 ou each body section, these two buttons co'operating to provide atbottom for the compartment 8. i

The method of moulding disclosed herein is`broadly claimed in the copending application of Kaufman, Lynn and myself, Serial No. 612,617, filed January 15, 1923:

The invention herein disclosed presents 75 elty to my invention, andsuch as are defined by the appended claims are deemed to be covered by the patent` issuing hereon. "85 1. A pencil'body formedof a composition l material and consisting of two duplicate sections each of the length/of the body, and means integral with the sections for centering the same relative to each other, the two -eftions being united to forma completed 2. A mechanical pencil body consisting of a plurality of fractional portions each of which is` a duplicate of vanother and each 95 of which isprovided withffa ton e and a groove, Vsaid fractional portions being united to form a unitary body. y 3. A mechanical pencil body composed of two portions each of which is complementary to and a duplicate of the other, the meeting facesof said portions beingv pro! vided with reciprocal projections and recesses for effecting accurate mating relation, said portions being joined to form a unitary 1'05 structure.' Y

4. A longitudinally recessed pencil body composed of' two portions each of which is complementary to and a duplicate of the other, the meeting faces of said portions being provided with reciprocal projections and .recesses for effectin accurate mating relation, said portionsbeing joined to 'orm a unitary structure, .the longitudinal recess being -divided by a transverse fwall to provide two compartments.

FRANK C. DELLl 

